Series – Railway Reasoning part – 10

Total Questions: 50

21. MOM, QSQ, UWU, ? [RRB NTPC 27/02/2021 (Evening)]

Correct Answer: (b) YAY
Solution:

For first letter: M + 4 = Q , Q + 4 = U , U + 4 = Y
For second letter: O + 4 = S , S + 4 = W W + 4 = A
For third letter: M + 4 = Q , Q + 4 = U , U + 4 = Y

22. 18, 19, 22, 31, 58, ? [RRB NTPC 27/02/2021 (Evening)]

Correct Answer: (c) 139
Solution:

18 + 3⁰ = 19
19 + 3¹ = 22
22 + 3² = 31
31 + 3³ = 58
58 + 3⁴ = 139

23. 1, 4, 9, 16, 25, ? [RRB NTPC 01/03/2021 (Morning)]

Correct Answer: (d) 36
Solution:

24. TSR, QPO, NML, ?

Correct Answer: (b) KJI
Solution:

T - 3 = Q , Q - 3 = N, then N - 3 = K
S - 3 = P , P - 3 = M, then M - 3 = J
R - 3 = O , O - 3 = L then L - 3 = I
Next term = KJI

25. 1331, 1728, ?, 2744 [RRB NTPC 01/03/2021 (Evening)]

Correct Answer: (d) 2197
Solution:

11³ = 1331, 12³ = 1728
13³ = 2197, 14³ = 2744

26. MJ, PM, SP, VS, ? [RRB NTPC 01/03/2021 (Evening)]

Correct Answer: (b) YV
Solution:

For first letter: M + 3 = P , P + 3 = S , S + 3 = V , V + 3 = Y For second letter: J + 3 = M , M + 3 = P , P + 3 = S , S + 3 = V
Therefore, next term = YV

27. 1, 4, 7, 2, 5, 8, 3, 6, ? [RRB NTPC 01/03/2021 (Evening)]

Correct Answer: (a) 9
Solution:

28. 2, 10, 26, ?, 82, 122 [RRB NTPC 02/03/2021 (Morning)]

Correct Answer: (c) 50
Solution:

29. Select the letter-custer from among the given options that is similar to the letter-chusters given below. [RRB NTPC 02/03/2021 (Morning)]

MDCL, QBAP, YHGX, TFES, ?

Correct Answer: (a) XJIW
Solution:

Similarly, XJIW → X - 1 = W and J - 1 = I

30. 2, 4, 3, 9, 8, 64, 63, ? [ RRB NTPC 02/03/2021 (Evening)]

Correct Answer: (a) 3969
Solution:

2 , 2² , 3 , 3² , 8 , 8² , 63 , 63²
Next term will be = 63² = 3969